1-4 Isotropy of space and JExample for J = J。 +r, × PBe carefor无法显示该图片。simpleR"basic"QVProblem!X0J =-2R2wmkr.×P。 = r ×2mv。= -2mRv, kJ = -2mR(rw+v.)k
1-4 Isotropy of space and J J = − R wm k c 2 2 J = − mR rw+ v k c 2 ( ) c c Pc J J r = + r P = r mv = − mRv k c c c 2 c 2 c Example for v r c c y O X R Be care for simple “basic” Problem!
S 2. Rigid body kinematics2-1 DefinitionAny two points (x -x,)" +(y - y,) +(z, -z,)" = dVs =inertial82-2 Translation and RotationAbout center of mass not unique convenient!But this kind of decomposition(center of mass) isnot unique !Generally :Motion =Translation +Rotation
§2. Rigid body kinematics About center of mass not unique convenient! But this kind of decomposition(center of mass) is not unique！ 2 2 1 2 2 1 2 2 1 2 (x − x ) + (y − y ) + (z − z ) = d v inertial s = 2-1 Definition Any two points 2-2 Translation and Rotation Generally :Motion =Translation +Rotation
Example :Kinetic energyConservationMomentumAngular momentumm0=?LV045°mom
Example : Conservation Kinetic energy Momentum Angular momentum v L v =? 0 L m m m 45o